/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayAbilityBlueprint.h
A Gameplay Ability Blueprint is essentially a specialized Blueprint whose graphs control a gameplay ability The ability factory should pick this for you automatically
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class UGameplayAbilityBlueprint : public [UBlueprint](API\Runtime\Engine\Engine\UBlueprint)